1645632 has 42 divisors (see below), whose sum is σ = 4718558. Its totient is φ = 548352.

The previous prime is 1645613. The next prime is 1645643. The reversal of 1645632 is 2365461.

1645632 is nontrivially palindromic in base 11.

It can be written as a sum of positive squares in only one way, i.e., 1498176 + 147456 = 1224^2 + 384^2 .

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1645596 and 1645605.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 853 + ... + 2004.

2^1645632 is an apocalyptic number.

1645632 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1645632 is an abundant number, since it is smaller than the sum of its proper divisors (3072926).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1645632 is a wasteful number, since it uses less digits than its factorization.

1645632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2875 (or 2862 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 1645632 is about 1282.8218894297. The cubic root of 1645632 is about 118.0622098477.

The spelling of 1645632 in words is "one million, six hundred forty-five thousand, six hundred thirty-two".